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Welding Residual Stress Analysis and Fatigue Crack Growth Characteristics of Multi-Pass Welded Pipe Weldment

机译：Welding Residual Stress Analysis and Fatigue Crack Growth Characteristics of Multi-Pass Welded Pipe Weldment

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摘要

Welding residual stresses are generated as a result of the largenonlinear thermal loading by a moving heat source. Moreover,multi-pass welding of thick section subjects to multiple thermalcycles and inelastic strain patterns. Thus, more complex residualstress distribution is generated through the plate thickness. Whenthese residual stresses are tensile, it makes increase the crackdriving force and reduce the resistance of brittle fracture.Therefore, accurate prediction of residual stresses is veryimportant. In this study, welding residual stresses of the multi-passwelded Al06 Gr B steel pipe weldment were analyzed by finite elementanalysis (FEA) using the element rebirth technique, and compared withexperimental results. And then, in order to estimate fatigue crackgrowth characteristics considered the effect of residual stresses,concept of crack closure effect was introduced. From the results, thetrend of welding residual stress distribution that was calculated byusing the element rebirth technique of FEA was well agreed with theexperimental result. And crack closure phenomena was not observedabove R =0.5. And also, K_op/K_max was independent of K_maxConsidering crack closure phenomenon in Al06 Gr B Steel weldment,fatigue crack growth characteristic curves can be effectivelyestimated.

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